default:
      
        /* Should have caught invalid param earlier, so we should
         * never reach here.
         */
        VT_ASSERT(0);
    }
  }
  while (0);
  
  VOLT_LOG_ERROR_COMPARE(status, libCtx, status, errorType,
    fnctLine,"VoltZDM2ReadGetParam", (unsigned char*)0)
    
  return status;
}

static int VoltZDM2ReadInit(
   VtZDMObject zdmObj
)
{
  int status = 0;
  VtLibCtx libCtx = (VtLibCtx)0;
  VoltZDM2ReadLocalCtx* readCtx;
  VOLT_DECLARE_FNCT_LINE(fnctLine)
  VOLT_DECLARE_ERROR_TYPE(errorType)
  
  VT_ASSERT(zdmObj != (VtZDMObject)0);

  libCtx = zdmObj->voltObject.libraryCtx;
  VT_ASSERT(libCtx != (VtLibCtx)0);
  readCtx = (VoltZDM2ReadLocalCtx*) zdmObj->localCtx;
  VT_ASSERT(readCtx != (VoltZDM2ReadLocalCtx*)0);
  VT_ASSERT(readCtx->mSecureArchive != (VtSecureArchiveObject)0);
  
  VOLT_SET_ERROR_TYPE(errorType, 0)
  
  do
  {
    if (readCtx->mInputStream == (VtStreamObject)0)
    {
      VOLT_SET_FNCT_LINE(fnctLine)
      status = VoltCreateTempBufferStream(libCtx,
        &readCtx->mBufferTypeInfo, &readCtx->mInputStream);
      if (status != 0)
        break;
      readCtx->mOwnsInputStream = 1;
    }
    
    VOLT_SET_FNCT_LINE(fnctLine)
    status = VtSecureArchiveReadInit(readCtx->mSecureArchive);
    if (status != 0)
      break;
      
    readCtx->mReadInitCalled = 1;
  }
  while (0);
  
  VOLT_LOG_ERROR_COMPARE(status, libCtx, status, errorType,
    fnctLine,"VoltZDM2ReadInit", (unsigned char*)0)
    
  return status;
}

static int VoltZDM2ReadUpdate(
   VtZDMObject zdmObj,
   unsigned char *message,
   unsigned int messageLen,
   unsigned int *bytesRead,
   unsigned char *outputData,
   unsigned int bufferSize,
   unsigned int *outputDataLen
)
{
  int status = 0;
  VtLibCtx libCtx = (VtLibCtx)0;
  VoltZDM2ReadLocalCtx* readCtx;
  VtZDMCurrentEntryInfo currentEntryInfo;
  VOLT_DECLARE_FNCT_LINE(fnctLine)
  VOLT_DECLARE_ERROR_TYPE(errorType)
  
  VT_ASSERT(zdmObj != (VtZDMObject)0);

  libCtx = zdmObj->voltObject.libraryCtx;
  VT_ASSERT(libCtx != (VtLibCtx)0);
  readCtx = (VoltZDM2ReadLocalCtx*) zdmObj->localCtx;
  VT_ASSERT(readCtx != (VoltZDM2ReadLocalCtx*)0);

  VOLT_SET_ERROR_TYPE(errorType, 0)
  
  do
  {
    if (!readCtx->mReadInitCalled)
    {
      VOLT_SET_ERROR_TYPE(errorType, VT_ERROR_TYPE_PRIMARY)
      VOLT_SET_FNCT_LINE(fnctLine)
      status = VT_ERROR_INVALID_CALL_ORDER;
      break;
    }
    
    /* If the current entry type is such that we're expecting output, then
     * (at least for this impl) there can't be any more input data, and there
     * must be an output buffer into which we'll put the data.
     */
    if ((readCtx->mCurrentEntryType == VT_ZDM_CURRENT_ENTRY_MESSAGE_BODY) ||
        (readCtx->mCurrentEntryType == VT_ZDM_CURRENT_ENTRY_ATTACHMENT))
    {
      if (message != (unsigned char*)0)
      {
        VOLT_SET_ERROR_TYPE(errorType, VT_ERROR_TYPE_PRIMARY)
        VOLT_SET_FNCT_LINE(fnctLine)
        status = VT_ERROR_INVALID_CALL_ORDER;
        break;
      }
      
      if (outputDataLen == (unsigned int*)0)
      {
        VOLT_SET_ERROR_TYPE(errorType, VT_ERROR_TYPE_PRIMARY)
        VOLT_SET_FNCT_LINE(fnctLine)
        status = VT_ERROR_NULL_ARG;
        break;
      }
    }

    switch (readCtx->mCurrentEntryType)
    {
      case VOLT_ZDM_CURRENT_ENTRY_NONE:
      
        /* VOLT_ZDM_CURRENT_ENTRY_NONE is the initial current entry
         * type for the ZDM object. The first thing the caller must do
         * is set the input data for the ZDM. This can be done by either
         * setting the input stream explicitly using the input stream
         * param, or by reading in the data with a series of update calls.
         * If the message data for the update call is NULL, then we assume
         * the caller has set the input stream explicitly.
         */
        if (message == (unsigned char*)0)
        {
          /* If the input stream was not set explicitly, then a temp
           * input stream will have been set in the ReadInit call and
           * the mOwnsInputStream flag will be set to 1. In that case
           * the user must be input the archive data with Update calls,
           * so it's an error if the message data is NULL.
           */
          if (readCtx->mOwnsInputStream)
          {
            VOLT_SET_ERROR_TYPE(errorType, VT_ERROR_TYPE_PRIMARY)
            VOLT_SET_FNCT_LINE(fnctLine)
            status = VT_ERROR_INVALID_CALL_ORDER;
            break;
          }
          
          /* The user has set the input stream explicitly, but hasn't
           * set the current entry yet, so we set the current entry type
           * to read the message body as the default current entry
           */
          currentEntryInfo.type = VT_ZDM_CURRENT_ENTRY_MESSAGE_BODY;
          VOLT_SET_FNCT_LINE(fnctLine)
          status = VtSetZDMParam(zdmObj, VtZDMParamCurrentEntry,
            (Pointer)&currentEntryInfo);
          if (status != 0)
            break;
          
          /* And now we call ourselves recursively to do the actual update */
          VOLT_SET_FNCT_LINE(fnctLine)
          status = VoltZDM2ReadUpdate(zdmObj, message, messageLen, bytesRead,
            outputData, bufferSize, outputDataLen);
          break;
        }
        
        VT_ASSERT(readCtx->mInputStream != (VtStreamObject)0);
        
        /* Write the input data to the input stream */
        VOLT_SET_FNCT_LINE(fnctLine)
        status = VtStreamWrite(readCtx->mInputStream, message, messageLen);
        if (status != 0)
          break;
        
        if (bytesRead != (unsigned int*)0)
          *bytesRead = messageLen;
        break;
        
      case VT_ZDM_CURRENT_ENTRY_MESSAGE_BODY:
      case VT_ZDM_CURRENT_ENTRY_ATTACHMENT:
      
        VOLT_SET_FNCT_LINE(fnctLine)
        status = VtSecureArchiveReadUpdate(readCtx->mSecureArchive, message,
          messageLen, bytesRead, outputData, bufferSize, outputDataLen);
        break;
        
      default:
      
        VOLT_SET_ERROR_TYPE(errorType, VT_ERROR_TYPE_PRIMARY)
        VOLT_SET_FNCT_LINE(fnctLine)
        status = VT_ERROR_INVALID_ZDM_ENTRY;
        break;
    }
  }
  while (0);
  
  VOLT_LOG_ERROR_COMPARE(status, libCtx, status, errorType,
    fnctLine,"VoltZDM2ReadUpdate", (unsigned char*)0)
    
  return status;
}

static int VoltZDM2ReadFinal(
   VtZDMObject zdmObj,
   unsigned char *message,
   unsigned int messageLen,
   unsigned int *bytesRead,
   unsigned char *outputData,
   unsigned int bufferSize,
   unsigned int *outputDataLen
)
{
  int status = 0;
  VtLibCtx libCtx = (VtLibCtx)0;
  VoltZDM2ReadLocalCtx* readCtx;
  VOLT_DECLARE_FNCT_LINE(fnctLine)
  VOLT_DECLARE_ERROR_TYPE(errorType)
  
  VT_ASSERT(zdmObj != (VtZDMObject)0);

  libCtx = zdmObj->voltObject.libraryCtx;
  VT_ASSERT(libCtx != (VtLibCtx)0);
  readCtx = (VoltZDM2ReadLocalCtx*) zdmObj->localCtx;
  VT_ASSERT(readCtx != (VoltZDM2ReadLocalCtx*)0);

  VOLT_SET_ERROR_TYPE(errorType, 0)
  
  do
  {
    VOLT_SET_FNCT_LINE(fnctLine)
  }
  while (0);
  
  VOLT_LOG_ERROR_COMPARE(status, libCtx, status, errorType,
    fnctLine,"VoltZDM2ReadFinal", (unsigned char*)0)
    
  return status;
}

static int VoltZDM2Verify(
   VtZDMObject zdmObj,
   VtPolicyCtx policyCtx,
   VtStorageCtx storageCtx,
   VtTransportCtx transportCtx,
   VtCertVerifyCtx certVerifyCtx,
   Pointer verifyCtxInfo,
   VtVerifyFailureList vfyFailList,
   unsigned int *verifyResult
)
{
  int status = 0;
  VtLibCtx libCtx = (VtLibCtx)0;
  VoltZDM2ReadLocalCtx* readCtx;
  VOLT_DECLARE_FNCT_LINE(fnctLine)
  VOLT_DECLARE_ERROR_TYPE(errorType)
  
  VT_ASSERT(zdmObj != (VtZDMObject)0);

  libCtx = zdmObj->voltObject.libraryCtx;
  VT_ASSERT(libCtx != (VtLibCtx)0);
  readCtx = (VoltZDM2ReadLocalCtx*) zdmObj->localCtx;
  VT_ASSERT(readCtx != (VoltZDM2ReadLocalCtx*)0);

  VOLT_SET_ERROR_TYPE(errorType, 0)
  
  do
  {
    VOLT_SET_FNCT_LINE(fnctLine)
    status = VtSecureArchiveVerify(readCtx->mSecureArchive, policyCtx,
      storageCtx, transportCtx, certVerifyCtx, verifyCtxInfo,
      vfyFailList, verifyResult);
  }
  while (0);
  
  VOLT_LOG_ERROR_COMPARE(status, libCtx, status, errorType,
    fnctLine,"VoltZDM2Verify", (unsigned char*)0)
    
  return status;
}

int VtZDM2ImplRead(
   VtZDMObject* obj,
   Pointer associatedInfo,
   unsigned int flags
)
{
  int status = 0;
  VtZDMObject zdmObj;
  VoltZDM2ReadLocalCtx* readCtx = (VoltZDM2ReadLocalCtx*)0;
  VtLibCtx libCtx = (VtLibCtx)0;
  VtReadZDMInfo* zdmReadInfo = (VtReadZDMInfo*)associatedInfo;
  VtReadSecureArchiveInfo secureArchiveReadInfo;
  VtReadSecureArchiveInfo* secureArchiveReadInfoPtr =
    (VtReadSecureArchiveInfo*)0;
  VOLT_DECLARE_FNCT_LINE(fnctLine)
  VOLT_DECLARE_ERROR_TYPE(errorType)
  
  VT_ASSERT(obj != (VtZDMObject*)0);
  VT_ASSERT(*obj != (VtZDMObject)0);
  
  do
  {
    VOLT_SET_ERROR_TYPE(errorType, VT_ERROR_TYPE_PRIMARY)

    if ((obj == (VtZDMObject*)0) || (*obj == (VtZDMObject)0))
    {
      VOLT_SET_FNCT_LINE(fnctLine)
      status = VT_ERROR_NULL_ARG;
      break;
    }
    
    zdmObj = *obj;
    libCtx = zdmObj->voltObject.libraryCtx;
    VT_ASSERT(libCtx != (VtLibCtx)0);
    
    if (flags != VOLT_ZDM_SET_TYPE_FLAG)
    {
      VOLT_SET_FNCT_LINE(fnctLine)
	    status = VT_ERROR_INVALID_TYPE;
	    break;
    }
    
    readCtx = (VoltZDM2ReadLocalCtx*) Z3Malloc(sizeof(VoltZDM2ReadLocalCtx));
    if (readCtx == (VoltZDM2ReadLocalCtx*)0)
    {
      VOLT_SET_FNCT_LINE(fnctLine)
      status = VT_ERROR_MEMORY;
      break;
    }
    
    Z2Memset(readCtx, 0, sizeof(VoltZDM2ReadLocalCtx));
    
    if (zdmReadInfo != (VtReadZDMInfo*)0)
    {
      secureArchiveReadInfo.decoderCount = zdmReadInfo->decoderCount;
      secureArchiveReadInfo.decoders = zdmReadInfo->decoders;
      secureArchiveReadInfo.derCoderCount = zdmReadInfo->derCoderCount;
      secureArchiveReadInfo.derCoders = zdmReadInfo->derCoders;
      secureArchiveReadInfo.mpCtx = zdmReadInfo->mpCtx;
      secureArchiveReadInfoPtr = &secureArchiveReadInfo;
    }
    
    VOLT_SET_FNCT_LINE(fnctLine)
    status = VtCreateSecureArchiveObject(libCtx, VtSecureArchiveImplRead,
      (Pointer)secureArchiveReadInfoPtr, &readCtx->mSecureArchive);
    if (status != 0)
      break;
      
    VOLT_SET_ERROR_TYPE(errorType, 0)

    readCtx->mBufferTypeInfo.bufferType = VT_BUFFER_TYPE_MEMORY;
    
    zdmObj->localCtx = (Pointer) readCtx;
    zdmObj->SetParam = VoltZDM2ReadSetParam;
    zdmObj->GetParam = VoltZDM2ReadGetParam;
    zdmObj->ReadInit = VoltZDM2ReadInit;
    zdmObj->ReadUpdate = VoltZDM2ReadUpdate;
    zdmObj->ReadFinal = VoltZDM2ReadFinal;
    zdmObj->Verify = VoltZDM2Verify;
    zdmObj->LocalCtxDestroy = VoltZDM2ReadLocalCtxDestroy;
  }
  while(0);  

  if (status != 0)
  {
    VoltZDM2ReadLocalCtxDestroy((Pointer)zdmObj, (Pointer)readCtx);
    
    VOLT_LOG_ERROR(libCtx, status, errorType,
      fnctLine, "VtZDM2ImplRead", (char *)0)
  }
    
  return status;
}

int VtZDMDetermineVersionAndType (
  VtLibCtx libCtx,
  unsigned char* message,
  unsigned int messageLength,
  unsigned int* version,
  unsigned int* type
)
{
  int status = 0;
  unsigned char* p;
  unsigned char* q;
  unsigned char* messageEnd = message + messageLength;
  unsigned int prefixLength;
  unsigned int suffixLength;
  unsigned int typeMsgLength;
  unsigned int typeAttachmentLength;
  long num;
  unsigned char versionBuffer[32];
  int foundVersion, foundType;
  VOLT_DECLARE_FNCT_LINE(fnctLine)
  
  *version = 0;
  *type = 0;
  
  do
  {
    prefixLength = Z2Strlen(VoltZDM2MetaVersionPrefix);
    suffixLength = Z2Strlen(VoltZDM2MetaSuffix);
    foundVersion = 0;
    for (p = message; p < messageEnd; p++)
    {
      if (VoltCaseInsensitiveCompareBuffers(p, prefixLength,
        VoltZDM2MetaVersionPrefix, prefixLength, libCtx) == 0)
      {
        p += prefixLength;
        for (q = p; q < messageEnd; q++)
        {
          if (VoltCaseInsensitiveCompareBuffers(q, suffixLength,
            VoltZDM2MetaSuffix, suffixLength, libCtx) == 0)
          {
            if (q - p < sizeof(versionBuffer))
            {
              Z2Memcpy(versionBuffer, p, q - p);
              versionBuffer[q - p] = 0;
              status = VoltDecimalStringToNum(versionBuffer, &num, libCtx);
              if ((status == 0) && (num >= 1) && (num <= VOLT_ZDM2_CURRENT_VERSION))
              {
                *version = (int)num;
                foundVersion = 1;
              }
              break;
            }
          }
        }
        if (foundVersion)
          break;
      }
    }
    
    if (!foundVersion)
    {
      VOLT_SET_FNCT_LINE(fnctLine)
      status = VT_ERROR_INVALID_ZDM_MSG;
      break;
    }

    prefixLength = Z2Strlen(VoltZDM2MetaTypePrefix);
    typeMsgLength = Z2Strlen(VoltZDM2TypeMessage);
    typeAttachmentLength = Z2Strlen(VoltZDM2TypeAttachment);
    foundType = 0;
    for (p = message; p < messageEnd; p++)
    {
      if (VoltCaseInsensitiveCompareBuffers(p, prefixLength,
        VoltZDM2MetaTypePrefix, prefixLength, libCtx) == 0)
      {
        p += prefixLength;
        for (q = p; q < messageEnd; q++)
        {
          if (VoltCaseInsensitiveCompareBuffers(q, suffixLength,
            VoltZDM2MetaSuffix, suffixLength, libCtx) == 0)
          {
            if (VoltCaseInsensitiveCompareBuffers(p, q - p,
              VoltZDM2TypeMessage, typeMsgLength, libCtx) == 0)
            {
              *type = VT_ZDM_MAIL;
              foundType = 1;
              break;
            }
            if (VoltCaseInsensitiveCompareBuffers(p, q - p,
              VoltZDM2TypeAttachment, typeAttachmentLength, libCtx) == 0)
            {
              *type = VT_ZDM_ATTACHMENT;
              foundType = 1;
              break;
            }
          }
        }
        if (foundType)
          break;
      }
    }
    
    if (!foundType)
    {
      VOLT_SET_FNCT_LINE(fnctLine)
      status = VT_ERROR_INVALID_ZDM_MSG;
      break;
    }
  }
  while (0);
  
  VOLT_LOG_ERROR_COMPARE(status , libCtx, status, VT_ERROR_TYPE_PRIMARY,
    fnctLine, "VtZDMDetermineVersionAndType", (unsigned char*)0)
  
  return status;
}